A block copolymer, an asphalt rejuvenator, a method for preparing the same, and a method for evaluating asphalt rejuvenation

Abstract

The application discloses a block copolymer, an asphalt regenerating agent and a preparation method and an asphalt regeneration evaluation method thereof, and belongs to the technical field of asphalt modification materials. The structural formula of the block copolymer is wherein y is an integer between 100 and 260, and x+z is an integer between 26 and 81. The block copolymer has a 'polarity-nonpolarity-polarity' segment structure, the polyvinylpyrrolidone segments at both ends can disperse the polarity aggregates, and the colloid structure stability of the asphalt can be restored; the polybutadiene segment in the middle can be embedded into the molecular network of the asphalt sample to be detected, and has a dual effect of plasticizing and compatibilizing.

Description

Technical Field

[0001] This application relates to a block copolymer, an asphalt regenerator, a preparation method thereof, and an asphalt regeneration evaluation method, belonging to the technical field of asphalt modified materials. Background Technology

[0002] During highway maintenance, the traditional methods of patching and milling are commonly used, resulting in a large amount of waste asphalt pavement material. If this waste pavement material is not properly disposed of, it not only causes a huge waste of state-owned assets but also requires a large amount of land for stockpiling. Furthermore, road petroleum asphalt and gravel are non-renewable resources. In recent years, due to environmental policies and other factors, high-quality gravel materials are not only in short supply but also experiencing rapid price increases, becoming a significant factor restricting highway construction and maintenance.

[0003] In-situ thermal recycling is a technology that uses a dedicated unit to heat and soften the road surface on-site, mill it, and then add a recycling agent to the fresh asphalt mixture. After high-temperature remixing, paving, leveling, and dynamic compaction, the existing road surface material is restored to its service performance. The role of asphalt recycling agent is particularly important, as it plays a vital role in maintaining the asphalt surface.

[0004] Currently, there are numerous types of rejuvenating agents on the market, which can be mainly divided into two categories according to their mechanism of action: one type is physical softening rejuvenators based on low-viscosity aromatic oils, naphthenic oils, etc., which mainly reduce viscosity by replenishing the light components missing in aged asphalt, but have limited ability to restore asphalt cohesion and adhesion; the other type is chemical rejuvenators containing active functional groups, which can react with the polar components in aged asphalt, thereby restoring its rheological properties and anti-aging ability to a certain extent. However, the above two types of rejuvenators have different restoration effects on asphalt from different sources or with different degrees of aging, and some samples even fail to meet the predetermined performance indicators. This makes it difficult to predict and guarantee the application effect of rejuvenators in actual engineering, which seriously restricts the promotion and quality of in-situ thermal recycling technology.

[0005] Therefore, there is a need for a regenerator with strong regeneration capabilities and a method for stable evaluation of the regeneration effect of asphalt. Summary of the Invention

[0006] To address the aforementioned issues, a block copolymer is provided, possessing a "polar-nonpolar-polar" segmental structure. The polyvinylpyrrolidone segments at both ends contain strongly polar lactam groups, which can strongly interact with the polar components such as asphaltenes and gums that aggregate due to oxidation in the asphalt sample, effectively breaking down the polar aggregates and restoring the colloidal structural stability of the asphalt. The polybutadiene segments in the middle possess good flexibility and nonpolar compatibility, enabling them to embed into the molecular network of the asphalt sample and play a dual role in plasticizing and compatibilizing.

[0007] One aspect of this application provides a block copolymer with the structural formula as follows: , where y is an integer between 100 and 260, and x+z is an integer between 26 and 81.

[0008] Another aspect of this application provides a method for preparing a block copolymer, comprising the following steps: S1: Vinylpyrrolidone is added to a solvent, and then an initiator and a catalyst are added to carry out a first-order addition reaction to obtain reactant A; S2: Butadiene is added to reactant A to carry out a second-order addition reaction to obtain reactant B; S3: Vinylpyrrolidone is added to reactant B to carry out a tertiary addition reaction to obtain the block copolymer.

[0009] Optionally, the reaction equation in step S1 is: .

[0010] Optionally, the reaction equation in step S2 is: .

[0011] Optionally, the reaction equation in step S3 is as follows: .

[0012] Optionally, in step S1, the molar ratio of vinylpyrrolidone to butadiene is 0.1~0.2:1.

[0013] Optionally, in step S3, the molar ratio of vinylpyrrolidone to butadiene is 0.1~0.2:1.

[0014] Optionally, the amount of catalyst added is 0.05% to 0.5% of the mass of vinylpyrrolidone.

[0015] Optionally, the reaction may also include a post-processing step, which is performed after the reaction is complete. The post-processing step includes, but is not limited to, washing, filtering, and drying.

[0016] Optionally, the solvent is selected from at least one of tetrahydrofuran, ethanol, isopropanol, acetone, and water.

[0017] Optionally, the initiator is selected from at least one of di-tert-butyl peroxide, benzoyl peroxide, azobisisobutyronitrile, and azobisisoheptanenitrile.

[0018] Optionally, the catalyst is selected from at least one of DMAP (4-dimethylaminopyridine), potassium dihydrogen phosphate, phosphorus pentoxide, aluminum oxide, and FeCl2 / PPh3.

[0019] Optionally, the reaction temperature of the first-order addition reaction in step S1 is 60~100℃, and the reaction time is 10~15h.

[0020] Optionally, the reaction temperature of the second-order addition reaction in step S2 is 60~100℃, and the reaction time is 18~24h.

[0021] Optionally, the reaction temperature of the second-order addition reaction in step S3 is 60~100℃, and the reaction time is 12~15h.

[0022] In another aspect of this application, an asphalt recycling agent is provided, comprising, by mass fraction: 100 parts of low-viscosity aromatic oil, 10-25 parts of block copolymer, 10-20 parts of plasticizer, 5-15 parts of asphalt, and 2-8 parts of anti-stripping agent; wherein the block copolymer is the block copolymer described above.

[0023] Optionally, the plasticizer is selected from phthalate plasticizers or epoxy fatty acid methyl esters.

[0024] Optionally, the anti-stripping agent is selected from at least one of amine anti-stripping agents and phosphate ester anti-stripping agents.

[0025] In another aspect, this application provides a method for preparing an asphalt recycling agent, comprising the following steps: A1: Mix the low-viscosity aromatic oil, plasticizer, and anti-stripping agent evenly to obtain a mixture; A2: Add asphalt and block copolymer to the mixture and stir to obtain the asphalt regenerator.

[0026] Optionally, the low-viscosity aromatic oil has a kinematic viscosity of 5~50 mm² / s at 40°C.

[0027] Optionally, in step A1, the stirring temperature is 50~60℃, the stirring rate is 300~500r / min, and the stirring time is 50-60min.

[0028] Optionally, in step A2, the stirring temperature is 90~100℃, the stirring rate is 300~500r / min, and the stirring time is 50~60min.

[0029] In another aspect, this application provides a method for evaluating the regeneration capacity of an asphalt recycling agent, comprising the following steps: (1) Sample collection: Collect samples of used asphalt pavement materials and unused raw asphalt materials; (2) Asphalt recycling: The used asphalt pavement material is recycled to obtain the asphalt sample to be tested; (3) Performance test: First, the performance index of the asphalt sample to be tested is determined; then, asphalt recycling agent as described above is added to the asphalt sample to be tested to obtain recycled asphalt sample, and then a second performance test is performed. (4) Effect evaluation: Compare the performance indicators of the recycled asphalt sample with those of the original asphalt material sample to evaluate the recovery effect of the asphalt recycling agent on the tested asphalt sample.

[0030] Optionally, the performance indicators include penetration, softening point, and ductility.

[0031] Optionally, the comparison criteria in step (4) include: first comparing whether recycled asphalt sample A and recycled asphalt sample B meet the penetration range in the asphalt use standard; if recycled asphalt sample A and recycled asphalt sample B do not meet the penetration range in the asphalt use standard, the asphalt recycling capacity is considered weak; if recycled asphalt sample A and recycled asphalt sample B meet the penetration range in the asphalt use standard, Z1 and Z2 are calculated, where Z1≥-2.5℃ and Z2≥0cm, the asphalt recycling capacity is considered strong, and Z1<-2.5℃ or Z2<0cm, the recycling capacity is considered weak. Z1 is the difference between the softening point value of the recycled asphalt sample and the softening point value in the asphalt use standard; Z2 is the difference between the ductility value of the recycled asphalt sample and the ductility value in the asphalt use standard.

[0032] The beneficial effects of this application include, but are not limited to: 1. The block copolymer according to this application has a unique "polar-nonpolar-polar" segmental structure: the polyvinylpyrrolidone segments at both ends contain strongly polar lactam groups, which can strongly interact with the polar components such as asphaltenes and gums that have aggregated due to oxidation in aged asphalt, effectively breaking down polar aggregates and restoring the colloidal structural stability of asphalt; the polybutadiene segments in the middle have good flexibility and nonpolar compatibility, and can be embedded in the molecular network of aged asphalt, playing a dual role of plasticizing and compatibilizing.

[0033] 2. The asphalt recycling agent according to this application, after being scientifically compounded with block copolymers, low-viscosity aromatic oils, plasticizers, anti-stripping agents and asphalt, exhibits stable and excellent component blending and performance recovery capabilities for recycled asphalt of different aging degrees and from different sources, thus achieving high adaptability of the recycling agent. Detailed Implementation

[0034] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0035] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application were all purchased commercially.

[0036] Unless otherwise specified, the methods used in the embodiments and comparative examples of this application are conventional methods in the prior art.

[0037] In this application, the vinylpyrrolidone in the embodiments is N-vinylpyrrolidone, CAS No.: 88-12-0; the butadiene is 1,3-butadiene, CAS No.: 106-99-0; the initiator, catalyst and solvent are all commonly used raw materials in the art, and those skilled in the art can select them according to actual needs; PPh3 is triphenylphosphine.

[0038] Example 1 This embodiment relates to a block copolymer with the following chemical structural formula: Where y is an integer between 100 and 260, and x+z is an integer between 26 and 81; The method for preparing this block copolymer includes the following steps: S1: Vinylpyrrolidone is added to a solvent, and then an initiator and a catalyst are added to carry out a first-order addition reaction to obtain reactant A; S2: Butadiene is added to reactant A to carry out a second-order addition reaction to obtain reactant B; S3: Vinylpyrrolidone is added to reactant B to carry out a tertiary addition reaction to obtain the block copolymer.

[0039] Block copolymer 1# A block copolymer with the following chemical structural formula: Where x is 40, y is 100, and z is 40; The method for preparing this block copolymer includes the following steps: S1: Add vinylpyrrolidone monomer and 20 times the amount of tetrahydrofuran to the reaction vessel, stir to dissolve, then add initiator and catalyst. The amount of azobisisobutyronitrile added is 1.2% of the weight of vinylpyrrolidone, and the amount of DMAP (4-dimethylaminopyridine) added is 0.05% of the weight of vinylpyrrolidone. The temperature is raised to 100℃, and a first-order addition reaction is carried out under nitrogen protection for 12 hours to obtain reactant A. S2: Butadiene is added to the reaction system of reactant A. The molar ratio of butadiene to vinylpyrrolidone in step S1 is 1:0.2. The reaction is continued at 100°C for 18 hours to carry out a second-order addition reaction. Nitrogen gas is continuously introduced during the reaction to obtain reactant B. S3: Add vinylpyrrolidone to reactant B. The molar ratio of vinylpyrrolidone to butadiene in step S2 is 0.2:1. Maintain the reaction temperature at 100°C for 12 hours to carry out a tertiary addition reaction. Nitrogen gas is continuously introduced during the reaction. After the reaction is completed, wash with ethanol three times, filter, and dry under vacuum at 50°C to constant weight to obtain a white powdery block copolymer.

[0040] Block copolymer 2# A block copolymer with the following chemical structural formula: Where x is 20, y is 260, and z is 20; The method for preparing this block copolymer includes the following steps: S1: Add vinylpyrrolidone monomer and a mixed solvent of isopropanol and water (volume ratio 3:1) of 20 times the amount of vinylpyrrolidone to the reactor. After stirring and dissolving, add the initiator benzoyl peroxide and FeCl2 / PPh3 composite catalyst (0.008g FeCl2 + 0.05g PPh3). The amount of benzoyl peroxide added is 1.5% of the weight of vinylpyrrolidone, and the amount of FeCl2 / PPh3 composite catalyst added is 0.05% of the weight of vinylpyrrolidone. Raise the temperature to 100℃ and carry out a first-order addition reaction under nitrogen protection for 12 hours to obtain reactant A. S2: Butadiene is added to the reaction system of reactant A. The molar ratio of butadiene to vinylpyrrolidone in step S1 is 1:0.1. The reaction is continued at 100°C for 20 hours to carry out a second-order addition reaction. Nitrogen gas is continuously introduced during the reaction to obtain reactant B. S3: Add vinylpyrrolidone to reactant B. The molar ratio of vinylpyrrolidone to butadiene in step S2 is 0.1:1. Continue the reaction at 100℃ for 12 hours to carry out a tertiary addition reaction. Nitrogen gas is continuously introduced during the reaction. After the reaction is completed, wash with ethanol three times, filter, and vacuum dry at 50℃ to constant weight to obtain a white powdered block copolymer.

[0041] Block copolymer 3# A block copolymer with the following chemical structural formula: Where x is 30, y is 200, and z is 30; The method for preparing this block copolymer includes the following steps: S1: Add vinylpyrrolidone monomer and acetone in an amount 20 times that of vinylpyrrolidone to the reaction vessel, stir to dissolve, and then add initiator azobisisobutyronitrile and potassium dihydrogen phosphate. The amount of azobisisobutyronitrile added is 1.0% of the weight of vinylpyrrolidone, and the amount of potassium dihydrogen phosphate added is 0.5% of the weight of vinylpyrrolidone. The temperature is raised to 60°C, and a first-order addition reaction is carried out under nitrogen protection for 15 hours to obtain reactant A. S2: Butadiene is added to the reaction system of reactant A. The molar ratio of butadiene to vinylpyrrolidone in step S1 is 1:0.2. The reaction is continued at 60°C for 24 hours to carry out a second-order addition reaction. Nitrogen gas is continuously introduced during the reaction to obtain reactant B. S3: Add vinylpyrrolidone to reactant B. The molar ratio of vinylpyrrolidone to butadiene in step S2 is 0.2:1. Continue the reaction at 60°C for 15 hours to carry out a tertiary addition reaction. Nitrogen gas is continuously introduced during the reaction. After the reaction is completed, wash three times with ethanol, filter, and vacuum dry at 50°C to constant weight to obtain a white powdery block copolymer.

[0042] Example 2 This embodiment relates to an asphalt recycling agent, which, by mass fraction, comprises: 100 parts of low-viscosity aromatic oil, 10-25 parts of block copolymer, 10-20 parts of plasticizer, 5-15 parts of asphalt, and 2-8 parts of anti-stripping agent; wherein the block copolymer is the block copolymer described in Example 1 above.

[0043] The preparation method of asphalt recycling agent includes the following steps: A1: Mix the low-viscosity aromatic oil, plasticizer, and anti-stripping agent evenly to obtain a mixture; A2: Add asphalt and block copolymer to the mixture and stir to obtain the asphalt regenerator.

[0044] Asphalt Recycling Agent #1 An asphalt recycling agent, by mass fraction, comprises: 100 parts of low-viscosity aromatic oil (Jiangxi Shengkang Chemical Aromatic Oil G17, kinematic viscosity at 40℃ 28 mm² / s), 15 parts of block copolymer 1#, 15 parts of plasticizer (dioctyl phthalate), 10 parts of 70# base asphalt, and 5 parts of anti-stripping agent (amine anti-stripping agent, model AR-1). The preparation method of asphalt recycling agent includes the following steps: A1: Add low-viscosity aromatic oil, plasticizer, and anti-stripping agent to the reaction vessel, heat to 55℃, and stir at 400 r / min for 15 min until homogeneous to obtain a mixture; A2: Add 70# base asphalt and block copolymer 1# to the mixture, heat to 95°C, and continue stirring at 450 r / min for 55 min until all components are completely melted into a homogeneous viscous liquid, thus obtaining the asphalt regeneration agent.

[0045] Asphalt Recycling Agent #2 An asphalt recycling agent, by mass fraction, comprises: 100 parts of low-viscosity aromatic oil (ExxonMobil EHC 20L, kinematic viscosity at 40℃ 7 mm² / s), 20 parts of block copolymer 2#, 12 parts of plasticizer (epoxy fatty acid methyl ester), 8 parts of 70# base asphalt, and 6 parts of anti-stripping agent (phosphate ester anti-stripping agent, model PA-2); The preparation method of asphalt recycling agent includes the following steps: A1: Add low-viscosity aromatic oil, plasticizer, and anti-stripping agent to the reaction vessel, heat to 60℃, and stir at a rate of 500 r / min for 10 min until homogeneous to obtain a mixture; A2: Add 70# base asphalt and block copolymer 2# to the mixture, heat to 100℃, and continue stirring at 500 r / min for 50 min until all components are completely melted into a homogeneous viscous liquid, thus obtaining the asphalt regeneration agent.

[0046] Asphalt Recycling Agent #3 An asphalt recycling agent, by mass fraction, comprises: 100 parts of low-viscosity aromatic oil (Shandong Taichang Petrochemical Technology Co., Ltd., kinematic viscosity at 40℃ 32.21 mm² / s), 10 parts of block copolymer 3#, 20 parts of plasticizer (dibutyl phthalate), 15 parts of 70# base asphalt, and 2 parts of anti-stripping agent (a phosphate ester anti-stripping agent (model PA-2) and an amine anti-stripping agent (model AR-1) compounded in a 1:1 ratio); The preparation method of asphalt recycling agent includes the following steps: A1: Add low-viscosity aromatic oil, plasticizer, and anti-stripping agent to the reaction vessel, heat to 60℃, and stir at a rate of 500 r / min for 10 min until homogeneous to obtain a mixture; A2: Add 70# base asphalt and block copolymer 2# to the mixture, heat to 100℃, and continue stirring at 500 r / min for 50 min until all components are completely melted into a homogeneous viscous liquid, thus obtaining the asphalt regeneration agent.

[0047] Comparison of asphalt recycling agent D1# The difference between asphalt recycling agent D1# and asphalt recycling agent 2# in this comparison is that the amount of plasticizer added is 8 parts, the amount of 70# base asphalt added is 5 parts, and the rest is the same as asphalt recycling agent 2#.

[0048] Comparison of asphalt recycling agent D2# The difference between asphalt recycling agent D2# and asphalt recycling agent 2# in this comparison is that D2# uses commercially available asphalt recycling agents.

[0049] Example 3 This embodiment relates to a method for evaluating the regeneration capacity of an asphalt recycling agent, comprising the following steps: (1) Sample collection: Two representative asphalt pavement milling material samples and two unused raw asphalt material samples were collected respectively: Asphalt pavement milling material is divided into: Asphalt pavement milling material sample A: G22 Qinglan Expressway, downhill K276+355~K287+351, intermediate layer AC-20; Asphalt pavement milling material sample B: G2516 Donglu Expressway Liaocheng section, surface layer SMA-13; (2) Asphalt recovery: According to the method of T0727-2025 in the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG 3410-2025), the above-mentioned asphalt pavement milling material sample A and asphalt pavement milling material sample B were extracted and recovered to obtain two kinds of recovered asphalt samples, which are respectively denoted as recovered asphalt sample A and recovered asphalt sample B. (3) Performance test: Add various asphalt rejuvenators in Example 2 to recycled asphalt sample A and recycled asphalt sample B respectively. The amount of asphalt rejuvenator added is 10% of the mass of the recycled asphalt sample. Stir at 160℃ for 3 minutes to make it evenly mixed to obtain recycled asphalt sample A and recycled asphalt sample B. Then perform penetration, softening point and ductility tests. (4) Effect Evaluation: Compare the penetration, softening point, and ductility of recycled asphalt sample A and recycled asphalt sample B with the asphalt usage standard. The comparison standard is to first compare whether recycled asphalt sample A and recycled asphalt sample B meet the penetration range in the asphalt usage standard. If recycled asphalt sample A and recycled asphalt sample B do not meet the penetration range in the asphalt usage standard, where the penetration range in the asphalt usage standard is 40-60 (0.1 mm), then the asphalt recycling capacity is considered weak. If recycled asphalt sample A and recycled asphalt sample B meet the asphalt usage standard, then the recycling capacity is considered weak. Using the penetration range in the standard, Z1 and Z2 are calculated. Z1 ≥ -2.5℃ and Z2 ≥ 0cm, indicating strong asphalt recycling ability; Z1 < -2.5℃ or Z2 < 0cm, indicating weak recycling ability. Z1 is the difference between the softening point value of the recycled asphalt sample and the softening point value (60℃) in the asphalt usage standard; Z2 is the difference between the ductility value of the recycled asphalt sample and the ductility value (20cm) in the asphalt usage standard. This is used to evaluate the recovery effect of the asphalt recycling agent on the tested asphalt sample.

[0050] The asphalt recycling agent in Example 2 was tested and evaluated using the above method, and the test results are shown in Table 1.

[0051] Table 1

[0052] According to the data in Table 1, asphalt recycling agents 1# to 3# can effectively restore the penetration, softening point and ductility of the two types of recycled asphalt samples, and have a good recycling effect on both types of asphalt samples. Although comparative asphalt recycling agents D1# and D2# have a certain restoration effect on the two types of asphalt samples, their recycling effect is not as good as that of asphalt recycling agents 1# to 3#.

[0053] The above description is merely an embodiment of this application, and the scope of protection of this application is not limited to these specific embodiments, but is determined by the claims of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the technical concept and principles of this application should be included within the scope of protection of this application.

Claims

1. A block copolymer, characterized in that, The structural formula is , where y is an integer between 100 and 260, and x+z is an integer between 26 and 81.

2. The method for preparing the block copolymer according to claim 1, characterized in that, Includes the following steps: S1: Vinylpyrrolidone is added to a solvent, and then an initiator and a catalyst are added to carry out a first-order addition reaction to obtain reactant A; S2: Butadiene is added to reactant A to carry out a second-order addition reaction to obtain reactant B; S3: Vinylpyrrolidone is added to reactant B to carry out a tertiary addition reaction to obtain the block copolymer.

3. The method for preparing the block copolymer according to claim 2, characterized in that, The first-order addition reaction in step S1 is carried out at a temperature of 60-100℃ for a reaction time of 10-15 hours; and / or The reaction temperature for the second-order addition reaction in step S2 is 60~100℃, and the reaction time is 18~24h; and / or The reaction temperature of the tertiary addition reaction in step S3 is 60~100℃, and the reaction time is 12~15h.

4. An asphalt recycling agent, characterized in that, The product comprises, by mass fraction: 100 parts of low-viscosity aromatic oil, 10-25 parts of block copolymer, 10-20 parts of plasticizer, 5-15 parts of asphalt, and 2-8 parts of anti-stripping agent; wherein the block copolymer is the block copolymer according to any one of claims 1-3.

5. The method for preparing the asphalt recycling agent according to claim 1, characterized in that, Includes the following steps: A1: Mix the low-viscosity aromatic oil, plasticizer, and anti-stripping agent evenly to obtain a mixture; A2: Add asphalt and block copolymer to the mixture and stir to obtain the asphalt regenerator.

6. The method for preparing the asphalt recycling agent according to claim 5, characterized in that, In step A1, the stirring temperature is 50~60℃, the stirring speed is 300~500r / min, and the stirring time is 50~60min.

7. The method for preparing the asphalt recycling agent according to claim 5, characterized in that, In step A2, the stirring temperature is 90~100℃, the stirring speed is 300~500r / min, and the stirring time is 50~60min.

8. The method for evaluating the regeneration capacity of the asphalt recycling agent according to any one of claims 4-6, characterized in that, Includes the following steps: (1) Sample collection: Collect samples of used asphalt pavement materials and unused raw asphalt materials; (2) Asphalt recycling: Recycling used asphalt pavement materials to obtain recycled asphalt samples; (3) Performance testing: The performance indicators of unused raw asphalt material samples were determined; Add the asphalt recycling agent as described in any one of claims 4-5 to the recycled asphalt sample to obtain a recycled asphalt sample, and then perform performance testing. (4) Effect evaluation: Compare the performance indicators of the recycled asphalt sample with those of the original asphalt material sample to evaluate the recovery effect of the asphalt recycling agent on the tested asphalt sample.

9. The method for evaluating the regeneration capacity of the asphalt recycling agent according to claim 8, characterized in that, The performance indicators include penetration, softening point, and ductility.

10. The method for evaluating the regeneration capacity of the asphalt recycling agent according to claim 9, characterized in that, The comparison criteria in step (4) include: first, comparing whether recycled asphalt sample A and recycled asphalt sample B meet the penetration range in the asphalt use standard. If recycled asphalt sample A and recycled asphalt sample B do not meet the penetration range in the asphalt use standard, the asphalt recycling capacity is considered weak. If recycled asphalt sample A and recycled asphalt sample B meet the penetration range in the asphalt use standard, Z1 and Z2 are calculated. Z1 ≥ -2.5℃ and Z2 ≥ 0cm, the asphalt recycling capacity is considered strong. Z1 < -2.5℃ or Z2 < 0cm, the recycling capacity is considered weak. Z1 is the difference between the softening point value of the recycled asphalt sample and the softening point value in the asphalt use standard. Z2 is the difference between the ductility value of the recycled asphalt sample and the ductility value in the asphalt use standard.

Images